PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
·
2023
·Vol. 220
·期 13
·2300087
·
IF 2
Zhou Zou,Dengwei Zhang,Arun Murali,Chaoyi Chen,Li Liu,Yuanpei Lan,Junshan Zhang,Fengyuan Liu,Zhiyao Chu,Deyang Ning,Junqi Li
Herein, size-controllable spherical yttrium carbonate powders with D 50 in range from 225 to 743 nm are synthesized from Y(NO 3 ) 3 ·6H 2 O and urea. With the rise of the concentration ratio of urea/Y 3+ , temperature, and extension of aging time, diameter of yttrium carbonate spheres increases. When the urea/Y 3+ is 40: 1 and ages for 4 h at 90 °C, the D 50 of synthesized powder, which has been determined as Y(OH)CO 3 ·1.3H 2 O, has the largest D 50 of 743 nm with (D 90 –D 10 )/2D 50 of 0.22. After decomposition, the D 50 of formed Y 2 O 3 decreases to 632 nm, the (D 90 –D 10 )/2D 50 is 0.24, and the D 50 of Y 2 O 3 is in the range of 126–632 nm. Then, 6 mol. % Eu 3+ is homogeneously doped into Y(OH)CO 3 ·1.3H 2 O and Y 2 O 3 : Eu 3+ spherical powder is obtained after roasting, which exhibits a strong emission peak at 613 nm. The developed synthetic method and the obtained size-controllable spherical Y(OH)CO 3 ·1.3H 2 O, Y 2 O 3 , and Y 2 O 3 : Eu 3+ with a uniform size distribution own various potential applications.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Fang He,Yongsheng Liu,Mengmeng Zheng,Zihua Liu,Yuan Pan
Yttrium-containing ceramics exhibit excellent resistance to water-oxygen corrosion, making them an attractive choice as the modified matrix for SiC f /SiC composites. However, the oxidation products of yttrium-containing ceramics are complex and vary widely in performance. In this study, YSOC ceramics, which are composed of yttrium silicate, SiO 2 , and SiC, were prepared using Y 2 O 3 , SiO 2 , SiC, and Li 2 CO 3 . This research investigated the effects of high temperatures, air oxidation, and water-oxygen corrosion on the phase compositions of YSOC ceramics. The influence of environmental factors on the synthesis and decomposition of yttrium silicate was analyzed. Moreover, the study explored the compatibility of different oxidation products with SiC. The results suggest that Y 2 SiO 5 and Y 2 Si 2 O 7 are formed through the low eutectic of SiO 2 , Y 2 O 3 , and Li 2 CO 3 . The high SiO 2 content likely contributes to the relatively low formation temperature of Y 2 Si 2 O 7 . In the oxidizing environment, Y 2 SiO 5 reacts with SiO 2 to produce Y 2 Si 2 O 7 . Conversely, in the water vapor-containing atmosphere, Y 2 Si 2 O 7 undergoes hydrolysis to form Y 2 SiO 5 . Y 2 Si 2 O 7 displays a reduced elastic modulus in comparison to SiC fibers and exhibits favorable physical and chemical compatibility with SiC fibers. However, the hydrolysis of Y 2 Si 2 O 7 may potentially affect the water-oxygen corrosion resistance of the ceramics. These findings will significantly advance research and enhance understanding of the water-oxygen corrosion behaviors of yttrium-containing matrix-modified composites.
研究领域:
材料科学
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腐蚀与防护
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DOI
高影响因子
CATALYSIS LETTERS
·
2025
·Vol. 155
·期 6
·1-13
·
IF 2.4
Cai Yao,Wang Qi,Wang Dingran,Zhang Tianfu,Fan Ting,Fu Di,Lu Yanghui,Sun Gonggang,Li Xinbao,Wang Kaige
Achieving carbon neutrality through CO 2 hydrogenation is critical for sustainable energy and chemical industries, where methanol production remains a key target. Despite existing catalysts, challenges persist in low CO 2 conversion, poor methanol selectivity, and activity instability. This study introduces a novel ternary Cu/Zn/Y catalyst synthesized via co-precipitation to address these limitations. Tested under 5 MPa, 250 °C, H 2 /CO 2 = 3:1, and 12,000 h⁻¹, the catalyst achieved a CO 2 conversion rate of 16.6% and a methanol selectivity of 56.6%, outperforming the CuZnAl benchmark with a 14.3% higher methanol space-time yield (402.3 mg/(gcat·h)). Optimal yttrium doping enhanced methanol selectivity by 20%, attributed to improved copper dispersion. However, excess Y occupancy disrupted Cu–Zn interactions, reducing CO 2 conversion and stability, highlighting critical trade-offs. These insight underscore the potential of Cu/Zn/Y catalysts for carbon-neutral technologies and emphasize the need for optimized Y doping to balance selectivity and stability. Graphical
研究领域:
催化化学
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能源与环境科学
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DOI
高影响因子
Metals
·
2025
·Vol. 15
·期 3
·307
·
IF 2.5
Ziyang Ruan,Zifan Zhao,Jing Feng
Rare-earth tantalates (RETaO4) are considered as a type of emerging thermal barrier coating materials applied to the hot components of gas turbines and aerospace engines due to their excellent thermal stability, high-temperature fracture toughness, corrosion resistance and extremely low thermal conductivity. However, the relatively low hardness and thermal expansion coefficients may limit their service lifetime in a harsh engine environment. To address the current limitation of rare-earth tantalates and further optimize the mechanical and thermal properties, the defective fluorite-structured Y₂Zr₂O₇ (YZ) was introduced as a second phase into the YTaO4(YT) matrix to form YT1−x–YZx(x = 0, 0.25, 0.5, 0.75, 1) composite ceramics in this work. The mechanical and thermal properties of YT1−x–YZxcomposite ceramics are significantly improved compared to pure-phase YTaO4ceramics. The Vickers hardness of YT1−x–YZx(x = 0.25, 0.5, 0.75) composite ceramics is 9.1~11.3 GPa, which are 2~2.5 times higher than that of YTaO4(4.5 GPa). Among them, YT0.75–YZ0.25exhibits a maximum fracture toughness (3.7 ± 0.5 MPa·m1/2), achieving a 23% improvement compared to YTaO4(3.0 ± 0.23 MPa·m1/2) and a 118% improvement compared to Y2Zr2O7(1.73 ± 0.28 MPa·m1/2). The enhancement is attributed to the combined effect of the intrinsic strengthening of the second phase, as well as the residual stress and grain refinement caused by the introduction of a second phase. Additionally, the thermal expansion coefficients of YT1−x–YZxcomposite ceramics at 1673 K range from 10.3 × 10⁻⁶ K⁻1to 11.0 × 10⁻⁶ K⁻1, which is also higher than that of YTaO4(10.0 × 10−6K−1). Consequently, the superior mechanical and thermal properties indicate that YT–YZ composite ceramics possess promising application prospects for thermal barrier coatings.
研究领域:
材料科学
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工程学
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2015
·
IF 2.947
Binglong Liu,Jiang Li,Roman Yavetskiy,Maxim Ivanov,Yanping Zeng,Tengfei Xie,Huamin Kou,Shangjun Zhuo,Yubai Pan,Jingkun Guo
Well-dispersed yttria nanopowders were synthesized by a precipitation method from yttrium nitrate solution using ammonium hydrogen carbonate as a precipitant. Needle-like precursor Y 2 (CO 3 ) 3 ·2.79 H 2 O undergoes fragmentation and decomposition into isolated quasi-spherical Y 2 O 3 particles upon calcination in air. Highly transparent YAG ceramics were fabricated from the as-synthesized Y 2 O 3 powder and the commercial α-Al 2 O 3 powder by vacuum sintering. Phase transformation, morphology evolution, and sinterability of Y 2 O 3 powders, microstructure and optical properties of YAG ceramics were investigated in detail. The densification, grain growth, linear shrinkage and phase transformation of the as-sintered ceramics were also explored. The activation energy for grain growth in the ceramic sample is 881 kJ/mol. With optimized preparation conditions, YAG ceramics with the average grain size of about 20 μm were fabricated by sintering at 1780 °C for 20 h, whose in-line transmittance reached 83.7% and 80.3% at the wavelength of 1064 nm and 400 nm, respectively.
研究领域:
材料科学
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无机化学
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DOI
高影响因子
MATERIALS AND MANUFACTURING PROCESSES
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2025
·
IF 4.7
Binfeng Pan,Jie Liu,Zhimin Zhang,Xuchen Lu
The process for preparing high-purity anhydrous yttrium chloride was investigated using a complex salt containing an excess of yttrium oxychloride. By studying the conversion of yttrium oxychloride, it was determined that the key to preparing high-purity anhydrous yttrium chloride lay in the synergistic actions of gas-solid and solid-solid reactions. On this basis, a purity control strategy involving the adjustment of the height-diameter ratio of the sample was proposed to inhibit hydrolysis and enhance the conversion rate. By adopting the purity control strategy, high-purity anhydrous yttrium chloride with a yttrium oxychloride content below 0.1 wt.% was obtained at 600°C when the height-diameter ratio of the samples exceeded 1.42. Finally, the experiments on preparing Mg-Y alloys through molten salt electrolysis validated the impact of the YCl3 purity on the electrolysis process. When the high-purity anhydrous yttrium chloride obtained by this strategy was utilized, the current efficiency could reach 83.7%.
研究领域:
材料科学
·
冶金工程
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DOI
高影响因子
EPL
·
2016
·Vol. 114
·期 5
·56003
·
IF 1.963
Lidong Dai,Lei Wu,Heping Li,Haiying Hu,Yukai Zhuang,Kaixiang Liu
In this study, the effect of pressure on undoped and 5% yttrium-doped SrZrO3 (SZY0 and SZY5) were conducted from the ambient condition to {\sim}25\ \text{GPa} with a diamond anvil cell. The comparison of the high-pressure Raman spectra of SZY0 and SZY5 indicate that SZY0 displays a rigid structure without any structural modification, whereas for SZY5 a structural transition at {\sim}15\ \text{GPa} is revealed. Some characteristic physical parameters such as bulk conductivities, grain boundary conductivities, Warburg diffusion coefficient, transference number and bulk relaxation frequency were determined by the high-pressure impedance spectroscopy data. An obvious discontinuous inflexion point (at {\sim}13\ \text{GPa}) for SZY5 sample is observable which was also verified the phase-transition of the Raman spectroscopy results. A mixed conduction mechanism for both SZY0 and SZY5 are coexisting for both SZY0 and SZY5 in a wide pressure range. The pressure-induced phase-transition of SZY5 would result in an inversion of conduction mechanism that is characterized by the dominant charge carriers transformation from electron to ion. The Maxwell-Wagner relaxation arising at the interfaces of grain and grain boundary indicates that Y-doping and pressure could make the ions diffusion much easier through the boundaries and finally enhance the dielectric performance of the sample. It is suggested that pressure could be a useful tool to manipulate the microstructure and dielectric performance of polycrystal through altering the grain boundary distribution.
研究领域:
材料科学
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物理学
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DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2025
·
IF 3.1
Lei Cao,Lin Liu,Kaiyi Luo,Pingping Qian,Haowen Chen,Yixiao Deng,Lei Yang,Xiaoyong Wu,Jun Tang
Skutterudites (SKDs) are promising thermoelectric (TE) materials due to their cost-effectiveness and favorable electrical properties. However, their high thermal conductivity limits thermoelectric conversion efficiency. Herein, Y 2 O 3 nanoparticles (NPs)-decorated n-type Yb 0.3 Co 4 Sb 12 were prepared by spark plasma sintering (SPS). The heterointerfaces created by Y 2 O 3 nanoparticles enhance charge carrier localization through O-Sb hybridization and O-Co bonding, which increases the Seebeck coefficient. Additionally, heterointerfaces scatter phonons, reducing thermal conductivity. Consequently, a figure of merit ( ZT ) value of ∼1.48 at 773 K and an average ZT ave of ∼1.0 (293 ∼ 823 K) were achieved in this work.
研究领域:
材料科学
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能源工程
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Wanying Wu,Mengmeng Lun,Zhifeng Xing,Hanzhao Song,Aihua Yao,Xunsheng Zhou,Zhong Wan,Kun-ming Gu,Sheng Yu,Qiliang Li,Yinzhen Wang,Wei Li,Guannan He,Benli Chu,Qinyu He
Te doped Yttrium-aluminum (Y 2 O 3 –Al 2 O 3 ) system powders were synthesized by solid-state method. The structure and optical properties were investigated by XRD , SEM, XPS and PL. XRD analysis indicated that the samples transform from YAM, YAP to YAG phase as the sintering temperature rises. The samples sintered below 1200 °C have a broad emission centered at 604 nm with a lifetime up to 13.33 μs under room temperature. While in the mix phase of YAP and YAG, a sharp and intense emission peak centered at 715 nm was monitored with a lifetime up to approximate 2.76 ms. Moreover, the band structure and density of states for Te doped YAGwere investigated by first-principle calculations.
研究领域:
材料科学
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光学
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DOI
高影响因子
Minerals
·
2025
·Vol. 15
·期 2
·153
·
IF 2.2
Kejia Ning,Jingzheng Wang,Li Zhang,Mengting Hong,Biao Fu,Jiushuai Deng,Xiahui Gui,Yaowen Xing,Guixia Fan,Hongxiang Xu
This systematic study was conducted on the separation of yttrium (Y) and erbium (Er) from a chloride medium using a mixed extractant system composed of [N1444][P507] and TRPO (trialkylphosphine oxide) in kerosene. This investigation focused on the effects of various extractants, extraction systems, the initial acidity of the aqueous phase, and the phase contact time on the extraction efficiencies of Y and Er. This study showed that using the combination of [N1444][P507] and TRPO notably increased the extraction performance and enhanced the separation factor between Y and Er, outperforming the individual use of P507 or [N1444][P507] under identical conditions. The extraction efficiencies for Y and Er reached 88.4% and 93.3%, respectively, with a separation factor (Er/Y) of 1.84, highlighting the system’s effectiveness in selectively isolating rare earth elements. Optimal stripping conditions were obtained using 0.1 mol/L of HCl, resulting in a successful recovery of 93.1% of Y3+and 78.9% of Er3+from the organic phase. The extraction mechanism involved both ion exchange and ion association. The enthalpy changes (ΔH) associated with the extraction of Y3+(−2.5 kJ·mol−1) and Er3+(4.6 KJ·mol−1) demonstrate that the extraction processes are exothermic, reflecting the thermodynamic differences between the two ions.
研究领域:
化学工程
·
材料科学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Li Lv,Junzhong Wang,Wei Wang,Limin Han
In this paper, Y 3+ ions doped CaMoO 4 :Eu 3+ with controlled microstructures were prepared via a hydrothermal method . All samples were fully characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), UV–vis diffuse reflectance spectroscopy, and photoluminescence measurement. The luminescent performance improvement aroused by doping was systematically investigated after inducing Y 3+ as co-doping ions in CaMoO 4 :Eu 3+ lattice. It is found that the lattice of Y 3+ doped CaMoO 4 :Eu 3+ nanocrystals contracted with increasing the Y 3+ concentration, resulting in a red shift of 1 A 1 → 1 T 1 transition from the valence band to the conduction band. Meanwhile, excitation band at 300 nm corresponding to the typical 1 A 1 → 1 T 1 transition also shifted to lower energy, originating from the charge-transfer between MoO 4 2− group and Eu 3+ ions. When the Y 3+ doping concentration was less than 0.05, the quantum efficiency of Y 3+ doped CaMoO 4 :Eu 3+ nanocrystals was all superior to pure CaMoO 4 :Eu 3+ nanocrystals, which can be assigned to the lattice structure contraction, co-doping effect, doping concentration variation. However, as the content of Y 3+ ions further increasing, Y 3+ ion should act as a luminescence killer, and therefore resulting in a nonradiative de-excitation.
研究领域:
材料科学
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光学
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DOI
高影响因子
PHYSICA B-CONDENSED MATTER
·
2021
·
IF 2.436
Fenhong Liu,Xiaojun Tan,Shoulei Xu,Xiangyu Wang,Bernard A. Goodman,Wen Deng
Thulium-doped yttrium aluminum garnet (YAG) single crystals with composition (Tm x Y (1- x ) ) 3 Al 5 O 12 (x = 0.001–0.02) were prepared by the optical floating zone method. The crystals were of high quality with no cracks, bubbles, or inclusions, and with >80% visible light transmittance . The lowest value for the mean positron lifetime was observed with crystals which had x = 0.01, which demonstrates that this composition had the fewest number of defects. This sample also produced the highest emission intensities in the PL spectra, and had narrower lines than those previously reported for Tm 3+ -doped yttria-stabilized zirconia. However, with higher Tm 3+ concentrations, interactions between neighboring Tm 3+ ions resulted in partial quenching of the luminescence. Overall, Tm-doped YAG single crystals synthesized by the optical floating zone (OFZ) method contained few defect centers and exhibited narrow luminescence linewidths , which demonstrate potential uses in high resolution applications.
研究领域:
材料科学
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光学
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DOI
高影响因子
危险品化学品经营许可证（带存储）